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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fff4c212708332fbc8b4317e252d8c6a62866a947a69f4d88055a8994b18f4' 
  AND token = 'lMaITN3ctGS/4Oyr7sOxlZYMl3lI27Dp8K6BflDU+30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}